Documentation update for 0.5.0 - beta

Updated documentation to include new features and tweaks.

* data store password encryption
* dataset category types and their relationships
* audit information for extract locations
* 'on hold' process status for when processes fail too many times

Author: OpenDataAlex

README.md

@@ -15,7 +15,7 @@ Found a bug?  Please go to the specific implementation project and add the issue
 * [Python][3]
 * [Kettle (aka PDI/Pentaho Data Integration)][4]
 
-[1]: https://process-tracker.readthedocs.io/
+[1]: https://process-tracker.readthedocs.io/en/latest/
 [2]: https://github.com/OpenDataAlex/process_tracker/issues
 [3]: https://github.com/OpenDataAlex/process_tracker_python/issues
 [4]: https://github.com/OpenDataAlex/process_tracker_kettle/issues